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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ce564c6da319a03103202048012587482e4fb74e5afc794166ca5cee995e46' 
  AND token = 'jmtQ5AWMgwXfF9T6haO/Gy19sLez4ZLrIFToBDXHFqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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