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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '375a47b5bb2e47a139c6a595e5aeb557d6e7aabbe0859e006bc682f65c39b3fc' 
  AND token = 'K9TJC5BR5/9iTpQXwbHC3dA4MaIZ4RJuOFuhlIOBvfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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