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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83427834fac5059f7ba427e1a7c002e2d38d3d587f2cdde4ffa28d6dac88ce8d' 
  AND token = '0Se5HNzPC3QHlhiG3h6SdpiJ88Kf87RYWk3Q/YK+Yhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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