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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ce6bae6d8ea9e3a6af920d76ac49e04693625a83f78ba375a6a984c1692419' 
  AND token = 'eaLBd4w3gxmOgxWuyDQAHPRqI4XYJj1cMcLnluTROIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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