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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dd01f43d87d03528e1704d2c056253cf238b899880476e9e0862943d7364241' 
  AND token = 't6WjTj9wKOIhSdAY6uftOgAx1Q3ZnyKALcloUNwFdmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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