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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'befcd3f6da16988b2e60ade8f9e6eb3df8cb5438a80eb0b10ca17dd71022d1b5' 
  AND token = 'bundSXxEutBsVUKOw7RFri/pr4jrO/S2LkbPWwXVpT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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