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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fcdff90afb6b9216b56ef189201c3153dbfd90ee03bb80ba37576060110d6ad' 
  AND token = 'c1KOhncnWitvAyv8+mg00LKCrU0hN6KkRjkfD5M1+6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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