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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17644001bd617ba70bfdb6901141bef4fd97d5ba7d1f570b5fdc695a21d504a7' 
  AND token = 'R27ndyPFuVZXRj7SuvKMVvnG/r4Xv22QDr4WUI9jmYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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