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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09bd3adf0c481542aa28af19d60d7a66613a9ccf0e0f0f462626213e1207658c' 
  AND token = 'Kx+T1c/KpYSjGuYjeCYEik8DieLvOKINOyE9UMwYM9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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