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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb958cb31f7696c8cf2ab8d7e81583f00c905700788ed7124c40ad8b58b8d2ff' 
  AND token = 'rwSwDDjFvv4otj80EPZ6o7+6zotexCinMFQ3NVYo3/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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