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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51834e0366507a55350888641fe88e4b5f1db76ea6b1fcc6f3c71971ab0be879' 
  AND token = 'KI5hM4RlXK6o1HzWT/LxZ8/klnc37/4+Dm9820/ZMZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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