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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b7c438462631d97a801b281c88a8a451379f6bc9bb0bd4b1194b7844cef33e9' 
  AND token = '+VMQSRF93x+YkE6SbA8YYDmnLFBi+ZxCUtHJMjC7ddY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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