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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80e9ff48f5609efff00839e0711e43994b8b3cab413c88b5d2015d3e6e452ece' 
  AND token = 'i4WvaRx9VijIvpNSu2y2QrCCk8ITTvaFX6Ltv816l/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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