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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81803088e1741dceb2eaa6a80fe277b41cd12186d3e57e9d064f86747399a566' 
  AND token = '68nrEaQNE8hbgEowOAhtmglle6BOLlZCFBL8VIEolZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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