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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f1cffed37c108cccac764d86761ac75ce781100a76d36b1ca22104626d1e795' 
  AND token = 'BTp5E9k/HSLAG6oVvSMiAu43dEFULvsvjuBd5Nv/yVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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