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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7b460c07924e4c690d3d541db9efffe9ae544c2ca801b39cbe68947abf6c43' 
  AND token = '4QcBLo0ycJaMZUoxxjJtNNave+1TUt8FgBBn8fNoO4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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