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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ac98be293b25769932d05b5333e6e794a45d59ccb9558e55526d2ab6d1ff4e' 
  AND token = 'e8cSRsZjCwNvVSaePmYVaEFnHyG5EUUpV2kDOXVtnKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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