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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc6c4a681f2dc477e511314cdde37331ace62f0f3af523a523f61c826cc0126' 
  AND token = 'nVyc32hgb8yPBjuIrWExAg8Eb7jZrFygoUlyxg4sR00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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