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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce1162b84594dfbf09aaa04326ed4c129e418c92013b0bf18dbb80a08176f32' 
  AND token = 'TViyFJFhNZ+SR/1HQZiqmG0GiSXk7ldc0Gd8AbFfaQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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