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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a59d0f0d4781af89d1841290a46714c00d4a6b35f79cc11d4e9cc0c797c861' 
  AND token = '3CkaXLbAvPQMUkipW7/LaDuYCXvne7DrAifGmV859M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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