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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de845fe45164570ca3bdc94d59ffa384918054a4a22d87d6a299187f3bb48ea3' 
  AND token = 'JMxWqyxI0Om11Ju4RZC3D8JREMz/60kQKA9jHtG77zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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