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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9edb79f739a8919dfe4271d94e2ab81d5c0f4e3087d5c0fe66ce1ff4f80ff22' 
  AND token = 'AGILCOrze4DPHk8F7iUU7X8bTtN3NgqdlW6XXNXjOyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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