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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e28ad92d31042218c13b07f9aafe0f7e35f2b9ce20a3fbdeb06be6847b9bb90' 
  AND token = 'QxDANPsxsQTMXohpNaafE7JcMR/ksX7sgN/7uKT9wKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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