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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd080b7609b8503e9811a2c7b0aa7d47e4c2fd2e6502c05ef405d674c39c2d0' 
  AND token = 'dzFfT7O2PyPsxpM5ULwsfjnkoSfoYlDUb5u3g9+jPCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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