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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4aed66dec8392b9acf4a48309c13180d81100d0a5ae19ccf1e9fbfa79359d30' 
  AND token = 'lYWCUK/0523inVg1sdIZ14xSzvs69kmvueXAn/ljCMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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