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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a527b43ef235071e0ce054d075a51524066e6f3ab0406cd94e2339f8de41022e' 
  AND token = 'UplYok8+DaJPokhmz5kuGKUUcy/iyZDC0vD3Ppktg6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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