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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c766c15bb6256ae44eac18a333e0582480d32dafd6a0ae675fe49c3f14f16eca' 
  AND token = 'okLvjTIVUTuly1HU1kWo7UWa3+tGTp2PR+eULqDDnpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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