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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a42d01a5b535d4d5f3d11e595ff6acc039d957c43e51d71cec685dc029007d' 
  AND token = '0WcR4KRT1qH/pb9xzn9nDrlxUyn/FDUyVouOW/2ZiQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}