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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af40a01686c728395d5944d2c858002a0ea37056d6748ba5d0c70be33fe72cec' 
  AND token = 'UB1PgIg0pI6CGwndmawp1xlBRyX+w80FP3nhR/pRDho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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