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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe40eb362a3746da7a62ddd0a5f951d71d110f2313e9ad709911d4bc0858e105' 
  AND token = 'N/YiPng8lSfVg5ko5qsGL94C0SV6VNZiTQ8PLsUTdSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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