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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9787cc2350dea41d00464d9cf16b66d63d3e9f103d610b15bd4ba553937cd7' 
  AND token = 'nsiCV9SF8ySFjWHka1ID3cPJyTLMga4iLY19T+XRQZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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