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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f469fcd9244faca98d916e9e66f0e38fe46976062eaf2ff4e93b37de19c5ed9' 
  AND token = '8x5b11amxTTO/1N8mUgDTfz6RL7bXLB8DBUv+l1KUvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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