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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cb7ae89c8990d7595cb11085cf7f1293a421cb0b76da93b3b93814a72994e8c' 
  AND token = 'hkfJSPI5gsn5y2fNmRX7DW2JeUFbjRRvzmzeffBrEo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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