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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baad41859fc7f3f4a530e7dc6b410f60a1690e2cd6ee2e0dcc3e587466fe4875' 
  AND token = 'IhlMP2ssQhNBY6kEhtNA2E+AsjYYc6BWT5nXfhWXnVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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