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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086bea30b19df9fd6bb217d7af7da48c4cc23b8d9f97fbc39e6207becb2be85d' 
  AND token = '98S/YLTZpQpoBu2UNKKqTkQEaj1qT4bpEK0VSvodD9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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