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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad2d15d1edc99fab78cbdf0a7d532dcb0e06db63113b9ddfdac325b82429b3b' 
  AND token = 'gh7j9YxQMHK3JZOW88zesF3Kcv6iv/OeTISvsQ0bfuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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