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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a9efc8d29fc6602923964897bd0b3601f83419c99c2ca447a2cbaa5657e44e' 
  AND token = 'YryX4EUaqooVbn7fS2tYKpIgCROkExXthGjdk7uOQ9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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