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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dcb33db86a88e958cdf07d67007bb9b6b877ae0b72043b095a62d33c0e8d105' 
  AND token = 'Ye+kwr+GHNn03pqRY9oMMPblbAdDHtkPHS0i0X93NmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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