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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc02a87b35c3f8cddc8b300034f3db043410d70fb1b00d696b12f214e8ba794' 
  AND token = 'RLMWkpmbsSS8RRkapF8psf4zHqaYzHBGjoHklV/8sik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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