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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03720493d87532ffa62e82fc4304f99291563306c25ea5c628ca8e4bafd22bba' 
  AND token = 'uoRIGYlGgIgRiRuLn3LF302yalWo2pZS+3Wj/RL3sYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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