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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb13e3c23245e5f94f706ac271e6cd112ac04d819fd7a937792c1127f71f438f' 
  AND token = 'DlGW18rdQ+4HmJB/R3Tf379dgXg7E/0ZD3ex6Esc4HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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