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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4c0e718631d37f0a519a8a713833d98f4cb9f031f446fb12c9485a8e06bbb2b' 
  AND token = 'BW04hlFypJBFhtUFtiSuhmw5BUsLkklc4UhPX7O99AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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