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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a57d3b621592f22e9185dfe71ebb84c4a4bd2c16426920fabff354dc5741dcb4' 
  AND token = '09Jc/AEUHOUyWTjwBRwvmndVnXnDI3bknQGRUrAsFVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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