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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45a65247e75f69452626f7186b71ba80c8cf21a9e01ab8519e269891715967c' 
  AND token = 'KAFT/pwu4GF6yzeidjMLo53V4K7dni9NypqGGy64jqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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