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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b777c5fd11ad7d1c04b70bcaaaa44d962f463839ae2e2d6017a90575d4c9b970' 
  AND token = 'Afe5fgnwZATTdVCnpQN/LhCcBkAZXKdeg1z+a5k6gms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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