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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7db5462a581a9d2dcef653c3e854d0666ac8081f88c0d9c88ae7a1c7c351cf' 
  AND token = '1O39p2bH8R843ztcmZKdtE+QpnvEzJpVmdRAFOr/yBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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