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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfeb9f4e8672ebad89badb1aa5bff523d9b56d151b7047885bfea96908a1790f' 
  AND token = '7U9fJqLOmG68eU81o80BC8L0W0v6DssYiuPJ2Xwdu4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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