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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa049c5eed9618d1d4932ef9a96b1e56ddd8b9ec640429882c017f8328c4cf5c' 
  AND token = 'h7GIXEpRArotY0lgjChFrICndp6CfvRWsxeeaZ+MsXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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