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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59c0b3701db334b7ebefce523830898eb6f1632cceea53e4b7347fdcf1ff19f4' 
  AND token = 'nf3gi0fJKcPZx7CxNT3xZbhoLJWh6IKX6i2ccu01BUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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