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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c291062b790881f08a48e96e8a029f32214cbe6d90f58cf96640809c0c9990' 
  AND token = 'ByTqmuUIT3x04/OJNwzudTrcXW++YrxqtWvwc0DXjNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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