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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ff32eb2b03b18b6e6a9ba1168e77f63c090170600a20a4c02c208c86ec98c1' 
  AND token = 'w1jbTifXE/czgr4ouWPThwi0AlGKnQmgKMJBASqTB/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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