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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca56a5e0905cf9146bd87f7d3143ab95d433c022a0accad46776121d49b92ee3' 
  AND token = 'zJTz/jQg28MvVIz6KLZ0L9ceNe0rcGGxpifAbggmawE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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