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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5312e1d3cd73616a7fc38363021c3d4e0525ac574215b0bfb1ddd28e1b91d963' 
  AND token = 'ZyW4qwgpwuIKHH7wH3E9FI9p/Nvt1d6T4SSgEcOV8XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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