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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca61b83ec2eb2af1ac314ff8cd39a4b1fa5b8f4bd0d4986aa0d7384c10504bf' 
  AND token = '1ZLEnj8UCtuNBIx60MkhkK1wRI0u195KnmqkXJQUGXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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