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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '107b4e5c0709dad72f3ddb9c50a185980ad41341c55f43fb3c08ec7310ab9a8e' 
  AND token = 'RS92SwzJu0QrHeyGQkITMG+3isZmBK17myOTHau4ksw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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