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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a9ab40fdafad2f224e37ba1c21aff1e9765d23332ed11c3499a70b1f4a2138' 
  AND token = 'xv5wYqpRRS1QT6MAJQy4GN7ccoigMepUvK/84zMbPPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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