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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ef165b6115c216721f3a8275c3db86fef543a97be9a58dd4f31e3697048678' 
  AND token = 'JTZ/RNIhqX+iXwl8jgwEFXk5eioUa05ej3EIE5/yfrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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