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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa116506204102a0ed0d87df7468ee46bcf0038728bbdd62fbe69cfe6e0af8e' 
  AND token = '9Mq5UdHIzBI2FxcIcUd3YcJg1yntsHVfWISP7Rbat78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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