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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ec3b19fcb77b38bad02a551e342af42edac9aeac666c26923fdaef8a24574a4' 
  AND token = 'ArCGfMpF+vpXTW/KMoga6rFTllGcWWV4o/Ozksk1jZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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