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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d29e08a65e3e15adfc6540822ed076548a417feff1ad374ec3c3eb916a83c59' 
  AND token = '//dSGeY2Ztl3Okhae3ermR15lJU1zJOP4KfcMT/gBPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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