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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b94deee489af0e3d1467b9d91c37bd1f3fdba53658180e6cb8a01d073103190' 
  AND token = 'bcORrNEDo+kMBx7kaMw5r1vE0342u3by4biBnJX266Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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