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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd12cd06e60914d4b429923b2b23f77e21c13a670209e1db2a17140aa04f721e3' 
  AND token = 'wWLpL+auqEjek03PU+vtYRPJmBTph9XTZSdM/gX1K2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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